Curve Inner Edges of an Mesh (Not the outer edges which I can use bevel on)
I didnt found a precise answer but you can delete the mirror modifier then delete the vertices that are in the positions (x,y,0) axis (so you should be left with a mesh that contains vertice that are connected,) then apply a screw modifier and change axis to y. then once you have that object you can apply the screw modifier then use knife to cut through in souch a way that it would be useful to add the mirror modifier again , apply the cut.Then enable clipping in the mirror modifier and scale at x axis to get a pleasing result.Also at this point instead of scaling you can play around with the curve modifier or others modifiers like deform.If you are good in nodes you can install a plugin called sverchok and try creating the cockpit there but it can be ways harder than doing it with this way.